======================
-LLVM 3.3 Release Notes
+LLVM 3.8 Release Notes
======================
.. contents::
:local:
-.. warning::
- These are in-progress notes for the upcoming LLVM 3.3 release. You may
- prefer the `LLVM 3.2 Release Notes <http://llvm.org/releases/3.2/docs
- /ReleaseNotes.html>`_.
-
Introduction
============
This document contains the release notes for the LLVM Compiler Infrastructure,
-release 3.3. Here we describe the status of LLVM, including major improvements
+release 3.8. Here we describe the status of LLVM, including major improvements
from the previous release, improvements in various subprojects of LLVM, and
some of the current users of the code. All LLVM releases may be downloaded
from the `LLVM releases web site <http://llvm.org/releases/>`_.
For more information about LLVM, including information about the latest
release, please check out the `main LLVM web site <http://llvm.org/>`_. If you
have questions or comments, the `LLVM Developer's Mailing List
-<http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>`_ is a good place to send
+<http://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send
them.
-Note that if you are reading this file from a Subversion checkout or the main
-LLVM web page, this document applies to the *next* release, not the current
-one. To see the release notes for a specific release, please see the `releases
-page <http://llvm.org/releases/>`_.
-
Non-comprehensive list of changes in this release
=================================================
+* With this release, the minimum Windows version required for running LLVM is
+ Windows 7. Earlier versions, including Windows Vista and XP are no longer
+ supported.
-.. NOTE
- For small 1-3 sentence descriptions, just add an entry at the end of
- this list. If your description won't fit comfortably in one bullet
- point (e.g. maybe you would like to give an example of the
- functionality, or simply have a lot to talk about), see the `NOTE` below
- for adding a new subsection.
+* With this release, the autoconf build system is deprecated. It will be removed
+ in the 3.9 release. Please migrate to using CMake. For more information see:
+ `Building LLVM with CMake <CMake.html>`_
+
+* The C API function LLVMLinkModules is deprecated. It will be removed in the
+ 3.9 release. Please migrate to LLVMLinkModules2. Unlike the old function the
+ new one
+
+ * Doesn't take an unused parameter.
+ * Destroys the source instead of only damaging it.
+ * Does not record a message. Use the diagnostic handler instead.
+
+* The C API functions LLVMParseBitcode, LLVMParseBitcodeInContext,
+ LLVMGetBitcodeModuleInContext and LLVMGetBitcodeModule have been deprecated.
+ They will be removed in 3.9. Please migrate to the versions with a 2 suffix.
+ Unlike the old ones the new ones do not record a diagnostic message. Use
+ the diagnostic handler instead.
+
+* The deprecated C APIs LLVMGetBitcodeModuleProviderInContext and
+ LLVMGetBitcodeModuleProvider have been removed.
+
+* The deprecated C APIs LLVMCreateExecutionEngine, LLVMCreateInterpreter,
+ LLVMCreateJITCompiler, LLVMAddModuleProvider and LLVMRemoveModuleProvider
+ have been removed.
+
+* With this release, the C API headers have been reorganized to improve build
+ time. Type specific declarations have been moved to Type.h, and error
+ handling routines have been moved to ErrorHandling.h. Both are included in
+ Core.h so nothing should change for projects directly including the headers,
+ but transitive dependencies may be affected.
-* The CellSPU port has been removed. It can still be found in older versions.
+* llvm-ar now suports thin archives.
-* The IR-level extended linker APIs (for example, to link bitcode files out of
- archives) have been removed. Any existing clients of these features should
- move to using a linker with integrated LTO support.
+* llvm doesn't produce .data.rel.ro.local or .data.rel sections anymore.
-* LLVM and Clang's documentation has been migrated to the `Sphinx
- <http://sphinx-doc.org/>`_ documentation generation system which uses
- easy-to-write reStructuredText. See `llvm/docs/README.txt` for more
- information.
+* aliases to available_externally globals are now rejected by the verifier.
-* TargetTransformInfo (TTI) is a new interface that can be used by IR-level
- passes to obtain target-specific information, such as the costs of
- instructions. Only "Lowering" passes such as LSR and the vectorizer are
- allowed to use the TTI infrastructure.
+* the IR Linker has been split into IRMover that moves bits from one module to
+ another and Linker proper that decides what to link.
-* We've improved the X86 and ARM cost model.
+* Support for dematerializing has been dropped.
-* The Attributes classes have been completely rewritten and expanded. They now
- support not only enumerated attributes and alignments, but "string"
- attributes, which are useful for passing information to code generation. See
- :doc:`HowToUseAttributes` for more details.
+* RegisterScheduler::setDefault was removed. Targets that used to call into the
+ command line parser to set the DAGScheduler, and that don't have enough
+ control with setSchedulingPreference, should look into overriding the
+ SubTargetHook "getDAGScheduler()".
-* TableGen's syntax for instruction selection patterns has been simplified.
- Instead of specifying types indirectly with register classes, you should now
- specify types directly in the input patterns. See ``SparcInstrInfo.td`` for
- examples of the new syntax. The old syntax using register classes still
- works, but it will be removed in a future LLVM release.
+* ``ilist_iterator<T>`` no longer has implicit conversions to and from ``T*``,
+ since ``ilist_iterator<T>`` may be pointing at the sentinel (which is usually
+ not of type ``T`` at all). To convert from an iterator ``I`` to a pointer,
+ use ``&*I``; to convert from a pointer ``P`` to an iterator, use
+ ``P->getIterator()``. Alternatively, explicit conversions via
+ ``static_cast<T>(U)`` are still available.
+
+* ``ilist_node<T>::getNextNode()`` and ``ilist_node<T>::getPrevNode()`` now
+ fail at compile time when the node cannot access its parent list.
+ Previously, when the sentinel was was an ``ilist_half_node<T>``, this API
+ could return the sentinal instead of ``nullptr``. Frustrated callers should
+ be updated to use ``iplist<T>::getNextNode(T*)`` instead. Alternatively, if
+ the node ``N`` is guaranteed not to be the last in the list, it is safe to
+ call ``&*++N->getIterator()`` directly.
+
+.. NOTE
+ For small 1-3 sentence descriptions, just add an entry at the end of
+ this list. If your description won't fit comfortably in one bullet
+ point (e.g. maybe you would like to give an example of the
+ functionality, or simply have a lot to talk about), see the `NOTE` below
+ for adding a new subsection.
* ... next change ...
Makes programs 10x faster by doing Special New Thing.
-AArch64 target
---------------
-
-We've added support for AArch64, ARM's 64-bit architecture. Development is still
-in fairly early stages, but we expect successful compilation when:
-
-- compiling standard compliant C99 and C++03 with Clang;
-- using Linux as a target platform;
-- where code + static data doesn't exceed 4GB in size (heap allocated data has
- no limitation).
-
-Some additional functionality is also implemented, notably DWARF debugging,
-GNU-style thread local storage and inline assembly.
-
-Hexagon Target
---------------
-
-- Removed support for legacy hexagonv2 and hexagonv3 processor
- architectures which are no longer in use. Currently supported
- architectures are hexagonv4 and hexagonv5.
-
-Loop Vectorizer
----------------
-We've continued the work on the loop vectorizer. The loop vectorizer now
-has the following features:
+Changes to the ARM Backends
+---------------------------
+
+During this release the AArch64 target has:
+
+* Added support for more sanitizers (MSAN, TSAN) and made them compatible with
+ all VMA kernel configurations (kurrently tested on 39 and 42 bits).
+* Gained initial LLD support in the new ELF back-end
+* Extended the Load/Store optimiser and cleaned up some of the bad decisions
+ made earlier.
+* Expanded LLDB support, including watchpoints, native building, Renderscript,
+ LLDB-server, debugging 32-bit applications.
+* Added support for the ``Exynos M1`` chip.
+
+During this release the ARM target has:
+
+* Gained massive performance improvements on embedded benchmarks due to finally
+ running the stride vectorizer in full form, incrementing the performance gains
+ that we already had in the previous releases with limited stride vectorization.
+* Expanded LLDB support, including watchpoints, unwind tables
+* Extended the Load/Store optimiser and cleaned up some of the bad decisions
+ made earlier.
+* Simplified code generation for global variable addresses in ELF, resulting in
+ a significant (4% in Chromium) reduction in code size.
+* Gained some additional code size improvements, though there's still a long road
+ ahead, especially for older cores.
+* Added some EABI floating point comparison functions to Compiler-RT
+* Added support for Windows+GNU triple, +features in -mcpu/-march options.
-- Loops with unknown trip count.
-- Runtime checks of pointers
-- Reductions, Inductions
-- If Conversion
-- Pointer induction variables
-- Reverse iterators
-- Vectorization of mixed types
-- Vectorization of function calls
-- Partial unrolling during vectorization
-The loop vectorizer is now enabled by default for -O3.
+Changes to the MIPS Target
+--------------------------
+
+During this release the MIPS target has:
-SLP Vectorizer
---------------
+* Significantly extended support for the Integrated Assembler. See below for
+ more information
+* Added support for the ``P5600`` processor.
+* Added support for the ``interrupt`` attribute for MIPS32R2 and later. This
+ attribute will generate a function which can be used as a interrupt handler
+ on bare metal MIPS targets using the static relocation model.
+* Added support for the ``ERETNC`` instruction found in MIPS32R5 and later.
+* Added support for OpenCL. See http://portablecl.org/.
-LLVM now has a new SLP vectorizer. The new SLP vectorizer is not enabled by
-default but can be enabled using the clang flag -fslp-vectorize. The BB-vectorizer
-can also be enabled using the command line flag -fslp-vectorize-aggressive.
+ * Address spaces 1 to 255 are now reserved for software use and conversions
+ between them are no-op casts.
+
+* Removed the ``mips16`` value for the -mcpu option since it is an :abbr:`ASE
+ (Application Specific Extension)` and not a processor. If you were using this,
+ please specify another CPU and use ``-mips16`` to enable MIPS16.
+* Removed ``copy_u.w`` from 32-bit MSA and ``copy_u.d`` from 64-bit MSA since
+ they have been removed from the MSA specification due to forward compatibility
+ issues. For example, 32-bit MSA code containing ``copy_u.w`` would behave
+ differently on a 64-bit processor supporting MSA. The corresponding intrinsics
+ are still available and may expand to ``copy_s.[wd]`` where this is
+ appropriate for forward compatibility purposes.
+* Relaxed the ``-mnan`` option to allow ``-mnan=2008`` on MIPS32R2/MIPS64R2 for
+ compatibility with GCC.
+* Made MIPS64R6 the default CPU for 64-bit Android triples.
+
+The MIPS target has also fixed various bugs including the following notable
+fixes:
+
+* Fixed reversed operands on ``mthi``/``mtlo`` in the DSP :abbr:`ASE
+ (Application Specific Extension)`.
+* The code generator no longer uses ``jal`` for calls to absolute immediate
+ addresses.
+* Disabled fast instruction selection on MIPS32R6 and MIPS64R6 since this is not
+ yet supported.
+* Corrected addend for ``R_MIPS_HI16`` and ``R_MIPS_PCHI16`` in MCJIT
+* The code generator no longer crashes when handling subregisters of an 64-bit
+ FPU register with undefined value.
+* The code generator no longer attempts to use ``$zero`` for operands that do
+ not permit ``$zero``.
+* Corrected the opcode used for ``ll``/``sc`` when using MIPS32R6/MIPS64R6 and
+ the Integrated Assembler.
+* Added support for atomic load and atomic store.
+* Corrected debug info when dynamically re-aligning the stack.
+
+Integrated Assembler
+^^^^^^^^^^^^^^^^^^^^
+We have made a large number of improvements to the integrated assembler for
+MIPS. In this release, the integrated assembler isn't quite production-ready
+since there are a few known issues related to bare-metal support, checking
+immediates on instructions, and the N32/N64 ABI's. However, the current support
+should be sufficient for many users of the O32 ABI, particularly those targeting
+MIPS32 on Linux or bare-metal MIPS32.
+
+If you would like to try the integrated assembler, please use
+``-fintegrated-as``.
+
+Changes to the PowerPC Target
+-----------------------------
+
+ During this release ...
+
+
+Changes to the X86 Target
+-----------------------------
+
+ During this release ...
+
+* TLS is enabled for Cygwin as emutls.
+
+* Smaller code for materializing 32-bit 1 and -1 constants at ``-Os``.
+
+* More efficient code for wide integer compares. (E.g. 64-bit compares
+ on 32-bit targets.)
+
+* Tail call support for ``thiscall``, ``stdcall`, ``vectorcall``, and
+ ``fastcall`` functions.
+
+Changes to the AVR Target
+-------------------------
+
+Slightly less than half of the AVR backend has been merged in at this point. It is still
+missing a number large parts which cause it to be unusable, but is well on the
+road to being completely merged and workable.
+
+Changes to the OCaml bindings
+-----------------------------
+
+ During this release ...
+
+* The ocaml function link_modules has been replaced with link_modules' which
+ uses LLVMLinkModules2.
-R600 Backend
-------------
-The R600 backend was added in this release, it supports AMD GPUs
-(HD2XXX - HD7XXX). This backend is used in AMD's Open Source
-graphics / compute drivers which are developed as part of the `Mesa3D
-<http://www.mesa3d.org>`_ project.
+External Open Source Projects Using LLVM 3.8
+============================================
+
+An exciting aspect of LLVM is that it is used as an enabling technology for
+a lot of other language and tools projects. This section lists some of the
+projects that have already been updated to work with LLVM 3.8.
+
+LDC - the LLVM-based D compiler
+-------------------------------
+
+`D <http://dlang.org>`_ is a language with C-like syntax and static typing. It
+pragmatically combines efficiency, control, and modeling power, with safety and
+programmer productivity. D supports powerful concepts like Compile-Time Function
+Execution (CTFE) and Template Meta-Programming, provides an innovative approach
+to concurrency and offers many classical paradigms.
+`LDC <http://wiki.dlang.org/LDC>`_ uses the frontend from the reference compiler
+combined with LLVM as backend to produce efficient native code. LDC targets
+x86/x86_64 systems like Linux, OS X and Windows and also PowerPC (32/64 bit)
+and ARM. Ports to other architectures like AArch64 and MIPS64 are underway.
Additional Information
projects / oota-llvm.git / blobdiff